there's a lesson on the 'galloping' appraoch in full access.... but it's really just doing it a bit slower and fewer notes in isolation before building it up.

Other than that, it'll just be listening to it and practicing... maybe use winamp / media player etc to slow it down? It's really down to doing less thinking in my opinion - we guitar players get so used to analysing everything and getting timing spot on that when variations in timing are necessary, it's difficult....

Try taking a small chunk and working on that....